Removal of chromium from tannery wastewater by electrosorption on carbon prepared from peach stones: effect of applied potential

Abstract

The objective of this study is the removal of chromium from tannery wastewater by electrosorption on carbon prepared from lignocellulosic natural residue "peach stones' thermally treated. The followed steps for obtaining coal in chronological order were: cleaning, drying, crushing and finally its carbonization at 900°C. The characterization of the carbon material resulted in properties comparable to those of many coals industrially manufactured. The study of the dynamic adsorption of chromium on the obtained material resulted in a low removal rate (33.7%) without applied potential. The application of negative potentials of -0.7 V and -1.4 increases the adsorption of chromium up to 90% and 96% respectively. Whereas a positive potential of +1.4V allows desorption of the contaminant of 138%.

Electro-adsorption as a Hybrid Processing to Removed Oil from Synthetic Oily Solution by Using Activated Carbon and Iron Electrodes

“…The longer the contact time between the adsorbent and the waste, the lower the oil-fat content (Okiel This research Electro-adsorption By using activated carbon and iron electrodes, the COD removal resulted from 57.46% to 75.92% and the oil-fat removal resulted from 99.33% to 99.65%. Mohammed et al, 2011 Adsorption Final oil concentration with adsorbent weight 2-8 g for 20 minutes from 20,000 ppm is 0 ppm (100% removal) for activated carbon and 10,000 ppm (50%) for zeolite Okiel et al, 2011 Adsorption The oil removal percentage using powdered activated carbon obtained 82.6% for oil concentration 836 mg/L and 72.5% for oil concentration that increased to 1613 mg/L Xie et al, 2018 Electrochemical adsorption Waste water-based treatment using electrochemical adsorption is a treatment without the potential environmental hazard Ziati et al, 2017 Electrosorption The application of potential had a signi cant result. The adsorption without potential obtained 33.7%, whereas with the application of -0.7 and -1.4 V potential, the adsorption of chromium up to 90% and 96% Ramli and Ghazi, 2020…”

“…Combining the two methods can be seen in its ability in the research of Xie et al (2018) , which used electrochemical adsorption and succeeded in adsorbing solid particles with sizes below 10 m with an e ciency rate of more than 90%. Research conducted by Ziati et al (2017) showed a high reduction rate using the electro-adsorption method to reduce chromium with the result reaching 96%.…”

“…The research that has been mentioned above focused on adsorption or electrolysis only. The combination of adsorption and electrolysis named electro-adsorption was done by Xie et al (2018) and Ziati et al (2017) also didn't focus on oily treatment by using activated carbon and iron electrodes. The adsorption method with activated carbon as an adsorbent is known to have a high level of oil adsorption in the waste.…”

A remarkable step in the aerobic biological treatment of Olive Mill Wastewater (OMW): A combination of selected microbial strains that enhance their decolorization and depollution

“…Treatment methods aim at eliminating as much toxic molecules as possible which are contained in these OMW through physical, chemical, and biological processes, which can be used separately or combined. Physical treatments such as activated sludge [24] nanofiltration [25], adsorption on activated carbon [26], etc. Chemical treatments such as the use of photocatalytic membranes [27], electrohydrolysis [28], and electrocoagulation [29].…”